model_iasp91.asc iasp91 velocity model 
remark: 1:Corad discon.; 2: Moho discon.
no   top-depth  Vp(km/s)  Vs(km/s)   remark
1     0        5.80        3.36      0
2     20       6.50        3.75      1
3     35       8.04        4.47      2
4     71       8.0442      4.4827    0